* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
input, button, textarea, select {
    outline: none;
    appearance: none;
    border: none;
}
li {
    list-style-type: none;
}
img {
    width: 100%;
    vertical-align: middle;
}
h1, h2, h3, h4, h5, h6, b {
    font-weight: normal;
    font-family: PingFangSC-Medium;
    color: #333333;
}
html {
  min-width: 320px;
  /* max-width: 540px; */
  margin: 0 auto;
}
